Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
  • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
  • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
  • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D237/12—Halogen atoms or nitro radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
  • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
  • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
  • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D237/18—Sulfur atoms
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
  • A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
  • A01N43/58—1,2-Diazines; Hydrogenated 1,2-diazines
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
  • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
  • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
  • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D237/14—Oxygen atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
  • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
  • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
  • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D237/14—Oxygen atoms
  • C07D237/16—Two oxygen atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
  • C07D237/02—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings
  • C07D237/06—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
  • C07D237/10—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D237/24—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
  • C07D403/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
  • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
  • C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
  • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
  • C07D409/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond

Definitions

• the present invention relates to novel pyridazine derivatives as active ingredients which have microbiocidal activity, in particular fungicidal activity.
• the invention also relates to preparation of these active ingredients, to novel heterocyclic derivatives used as intermediates in the preparation of these active ingredients, to preparation of these novel intermediates, to agrochemical compositions which comprise at least one of the novel active ingredients, to preparation of these compositions and to use of the active ingredients or compositions in agriculture or horticulture for controlling or preventing infestation of plants or non-living materials by phytopathogenic microorganisms, preferably fungi.
• the present invention provides in a first aspect a compound of formula I:
• R 2 and R 3 independently from each other, are optionally substituted aryl or heteroaryl; or an agrochemically usable salt form thereof; provided that when R 1 and R 4 are both hydroxy or chloro and R 3 is phenyl, R 2 is different from phenyl, when R 1 and R 4 are both hydroxy or chloro and R 3 is 4-chlorophenyl, R 2 is different from 4- chlorophenyl or pyridin-4-yl, and when R 1 and R 4 are both fluoro and R 3 is pentafluorophenyl, R 2 is different from pentafluorophenyl.
• R 2 and R 3 independently from each other, are optionally substituted aryl or heteroaryl; or an agrochemically usable salt form thereof.
• aryl includes aromatic hydrocarbon rings like phenyl, naphthyl, anthracenyl, phenanthrenyl and biphenyl, with phenyl being preferred.
• halogen is fluorine, chlorine, bromine or iodine.
• Alkyl on its own or as part of another substituent is, depending upon the number of carbon atoms mentioned, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl and the isomers thereof, for example, isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl or tert-pentyl.
• a haloalkyl group may contain one or more identical or different halogen atoms and, for example, may stand for CH 2 CI, CHCI 2 , CCI 3 , CH 2 F, CHF 2 , CF 3 , CF 3 CH 2 , CH 3 CF 2 , CF 3 CF 2 or CCI 3 CCI 2 .
• Cycloalkyl on its own or as part of another substituent is, depending upon the number of carbon atoms mentioned, for example, cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl.
• Alkenyl on its own or as part of another substituent is, depending upon the number of carbon atoms mentioned, for example, ethenyl, allyl, 1-propenyl, buten-2-yl, buten-3-yl, penten-1-yl, penten-3-yl, hexen-1-yl or 4-methyl-3-pentenyl.
• Alkynyl on its own or as part of another substituent is, depending upon the number of carbon atoms mentioned, for example, ethynyl, propyn-1-yl, propyn-2-yl, butyn-1-yl, butyn-2- yl, 1-methyl-2-butynyl, hexyn-1-yl or 1-ethyl-2-butynyl.
• the presence of one or more possible asymmetric carbon atoms in a compound of formula I means that the compounds may occur in optically isomeric, that means enantiomeric or diastereomeric forms.
• optically isomeric that means enantiomeric or diastereomeric forms.
• geometric isomerism that means cis-trans or (E)-(Z) isomerism may also occur.
• atropisomers may occur as a result of restricted rotation about a single bond.
• Formula I is intended to include all those possible isomeric forms and mixtures thereof.
• the present invention intends to include all those possible isomeric forms and mixtures thereof for a compound of formula I.
• R 1 is hydroxy, halogen, Ci-C 6 alkoxy, Ci-C 6 haloalkoxy, C 1 - C 6 alkylthio, C r C 6 alkylamino or cyano.
• R 2 is optionally substituted phenyl, naphtyl, furyl, benzofuryl, thienyl, benzothienyl, pyridinyl, quinolyl, pyridazinyl or pyrimidinyl.
• R 3 is optionally substituted phenyl, quinolyl, pyridinyl, pyrimidinyl, pyridazinyl or pyrazinyl.
• R 4 is hydroxy, halogen, C 1 -C 6 BIkOXy , CrCehaloalkoxy, C r C 6 alkylthio, Ci-C 6 alkylamino or cyano.
• Preferred subgroups of compounds of formula I according to the invention are those wherein R 1 is hydroxy, halogen, Ci-C 6 alkoxy, d-C ⁇ haloalkoxy, d-C ⁇ alkylthio or cyano; R 2 is optionally substituted phenyl, naphtyl, furyl, thienyl, pyridinyl, quinolyl, pyridazinyl or pyrimidinyl;
• R 3 is optionally substituted phenyl, pyridinyl, pyrimidinyl, pyridazinyl or pyrazinyl; and R 4 is hydroxy, halogen, CrC 6 alkoxy, d-C ⁇ haloalkoxy, d-C ⁇ alkylthio or cyano.
• R 1 is hydroxy, halogen, d-C 6 alkoxy, d-C 6 haloalkoxy or cyano
• R 2 is 3-fluorophenyl, 3-chlorophenyl, 3-bromophenyl, m-tolyl, 3-trifluoromethylphenyl, 3- ethylphenyl, 3-methoxyphenyl, 3-trifluoromethoxyphenyl, 3-benzonitrile, 4-fluorophenyl, 4- chlorophenyl, 4-bromophenyl, p-tolyl, 4-trifluoromethylphenyl, 4-ethylphenyl, 4- methoxyphenyl, 4-trifluoromethoxyphenyl, 4-benzonitrile, 3,4-difluorophenyl, 3-chloro-4- fluorophenyl, 4-chloro-3-fluorophenyl, 3,4-dichlorophenyl,
• R 1 is hydroxy, halogen, C r C 6 alkoxy or cyano
• R 2 is 3-fluorophenyl, 3-chlorophenyl, 3-bromophenyl, m-tolyl, 3-trifluoromethylphenyl, 3- ethylphenyl, 3-methoxyphenyl, 3-trifluoromethoxyphenyl, 3-benzonitrile, 4-fluorophenyl, 4- chlorophenyl, 4-bromophenyl, p-tolyl, 4-trifluoromethylphenyl, 4-ethylphenyi, 4- methoxyphenyl, 4-trifluoromethoxyphenyl, 4-benzonitrile, 3,4-difluorophenyl, 3-chloro-4- fluorophenyl, 4-chloro-3-fluorophenyl, 3,4-dichlorophenyl, 3,4-dimethylphenyl, 4-chloro-3- methylphenyl, 3-chloro-4-methylphenyl, 3,5-dichlorophenyl, 3,5-dimethylphenyl,
• R 1 is hydroxy, halogen or d-C 6 alkoxy
• R 2 is 3-chlorophenyl, 3-bromophenyl, m-tolyl, 3-trifluoromethylphenyl, 4-fluorophenyl, 4- chlorophenyl, 4-bromophenyl, p-tolyl, 4-ethylphenyl, 4-methoxyphenyl or 3,4-dichlorophenyl
• R 3 is 2-chloro-6-fluorophenyl or 2,4,6-trifluorophenyl
• R 4 is hydroxy or halogen.
• Preferred individual compounds are:
• pyridazine derivatives like 4,5-diphenyl-pyridazine-3,6-diol and 3,6-dichloro-4,5- diphenyl-pyridazine are already known from J. Chem. Soc. C 1 1970, 1316.
• Other pyridazine derivatives like 3,6-difluoro-4,5-bis-pentafluorophenyl-pyridazine are known from J. Chem. Soc. Perkin Trans.
• the product obtained by this reaction is depending on the substitution pattern of R 2 and R 3 , as well as on the number of equivalents of R 5 XH or MXR 5 used in the reaction.
• compounds 1.2, 1.3 or I.4 can be obtained individually, or mixtures of compounds 1.2 and 1.3, of compounds 1.3 and 1.4, of compounds 1.2 and 1.4 or of compounds 1.2 and 1.3 and I.4 can be obtained. (I.2) and/or (I.3)
• the compounds of formula 1.5 wherein R 2 and R 3 are as defined for compound of formula I, can be obtained by reaction of a maleic anhydride of formula II, wherein R 2 and R 3 are as defined for compound of formula I, with a hydrazine derivative, e.g. hydrazine hydrate, as already described in J. Chem. Soc. C, 1970, 1316.
• a hydrazine derivative e.g. hydrazine hydrate
• the maleic anhydride of formula II, wherein R 2 and R 3 are as defined for compound of formula I 1 can be obtained by reaction of a glyoxylic acid salt of formula III, wherein R 2 is as defined for compound of formula I and M is an alkali metal, preferably potassium or sodium, with an acetic acid derivative of formula IV, wherein R 3 is as defined for compound of formula I, as already described in WO 2001/19939 or in J. Org. Chem., 1990, 55, 5165.
• novel compounds of formula I have, for practical purposes, a very advantageous spectrum of activities for protecting plants against diseases that are caused by fungi as well as by bacteria and viruses.
• the compounds of formula I can be used in the agricultural sector and related fields of use as active ingredients for controlling plant pests or on non-living materials for control of spoilage microorganisms or organisms potentially harmfull to man.
• the novel compounds are distinguished by excellent activity at low rates of application, by being well tolerated by plants and by being environmentally safe. They have very useful curative, preventive and systemic properties and are used for protecting numerous cultivated plants.
• the compounds of formula I can be used to inhibit or destroy the pests that occur on plants or parts of plants (fruit, blossoms, leaves, stems, tubers, roots) of different crops of useful plants, while at the same time protecting also those parts of the plants that grow later e.g. from phytopathogenic microorganisms.
• compositions comprising a compound of formula I before planting: seed, for example, can be dressed before being sown.
• the active ingredients according to the invention can also be applied to grains (coating), either by impregnating the seeds in a liquid formulation or by coating them with a solid formulation.
• the composition can also be applied to the planting site when the propagation material is being planted, for example, to the seed furrow during sowing. The invention relates also to such methods of treating plant propagation material and to the plant propagation material so treated.
• the compounds according to present invention can be used for controlling fungi in related areas, for example in the protection of technical materials, including wood and wood related technical products, in food storage, in hygiene management.
• the invention could be used to protect non-living materials from fungal attack, e.g. lumber, wall boards and paint.
• the compounds of formula I are, for example, effective against the phytopathogenic fungi of the following classes: Fungi imperfecti (e.g. Botrytis spp., Alternaria spp.) and Basidiomycetes (e.g. Rhizoctonia spp., Hemileia spp., Puccinia spp., Phakopsora spp., Ustilago spp., Tilletia spp.). Additionally, they are also effective against Ascomycetes (e.g.
• Venturia spp. Blumeria spp., Podosphaera leucotricha, Monilinia spp., Fusarium spp., Uncinula spp., Mycosphaerella spp., Pyrenophora spp., Rhynchosporium secalis, Magnaporthe spp., Colletotrichum spp., Gaeumannomyces graminis, Tapesia spp., Ram ⁇ laha spp., Microdochium nivale, Sclerotica spp.) and Oomycetes (e.g.
• Phytophthora spp. Pythium spp., Plasmopara spp., Pseudoperonospora cubensis).
• Outstanding activity has been observed against powdery mildews (e.g. Uncinula necator), rusts (e.g. Puccinia spp.) and leaf spots (e.g. Septoria tritic ⁇ ).
• the novel compounds of formula I are effective against phytopathogenic bacteria and viruses (e.g. against Xanthomonas spp, Pseudomonas spp, Erwinia amylovora as well as against the tobacco mosaic virus).
• target crops to be protected typically comprise the following species of plants: cereal (wheat, barley, rye, oat, rice, maize, sorghum and related species); beet (sugar beet and fodder beet); pomes, drupes and soft fruit (apples, pears, plums, peaches, almonds, cherries, strawberries, raspberries and blackberries); leguminous plants (beans, lentils, peas, soybeans); oil plants (rape, mustard, poppy, olives, sunflowers, coconut, castor oil plants, cocoa beans, groundnuts); cucumber plants
• the target crops in accordance with the invention include conventional as well as genetically enhanced or engineered varieties such as, for example, insect resistant (e.g. Bt. and VIP varieties) as well as disease resistant, herbicide tolerant (e.g. glyphosate- and glufosinate-resistant maize varieties commercially available under the trade names RoundupReady® and LibertyLink®) and nematode tolerant varieties.
• suitable genetically enhanced or engineered crop varieties include the Stoneville 5599BR cotton and Stoneville 4892BR cotton varieties.
• the compounds of formula I are used in unmodified form or, preferably, together with the adjuvants conventionally employed in the art of formulation. To this end they are conveniently formulated in known manner to emulsifiable concentrates, coatable pastes, directly sprayable or dilutable solutions or suspensions, dilute emulsions, wettable powders, soluble powders, dusts, granulates, and also encapsulations e.g. in polymeric substances.
• the methods of application such as spraying, atomising, dusting, scattering, coating or pouring, are chosen in accordance with the intended objectives and the prevailing circumstances.
• the compositions may also contain further adjuvants such as stabilizers, antifoams, viscosity regulators, binders or tackifiers as well as fertilizers, micronutrient donors or other formulations for obtaining special effects.
• Suitable carriers and adjuvants can be solid or liquid and are substances useful in formulation technology, e.g. natural or regenerated mineral substances, solvents, dispersants, wetting agents, tackifiers, thickeners, binders or fertilizers. Such carriers are for example described in WO 97/33890.
• the compounds of formula I are normally used in the form of compositions and can be applied to the crop area or plant to be treated, simultaneously or in succession with further compounds.
• further compounds can be e.g. fertilizers or micronutrient donors or other preparations, which influence the growth of plants. They can also be selective herbicides as well as insecticides, fungicides, bactericides, nematicides, molluscicides or mixtures of several of these preparations, if desired together with further carriers, surfactants or application promoting adjuvants customarily employed in the art of formulation.
• the compounds of formula I are normally used in the form of fungicidal compositions for controlling or protecting against phytopathogenic microorganisms, comprising as active ingredient at least one compound of formula I, in free form or in agrochemically usable salt form, and at least one of the above-mentioned adjuvants.
• the compounds of formula I can be mixed with other fungicides, resulting in some cases in unexpected synergistic activities.
• Mixing components which are particularly preferred are: Azoles, such as azaconazole, BAY 14120, bitertanol, bromuconazole, cyproconazole, difenoconazole, diniconazole, epoxiconazole, fenbuconazole, fluquinconazole, flusilazole, flutriafol, hexaconazole, imazalil, imibenconazole, ipconazole, metconazole, myclobutanil, pefurazoate, penconazole, prothioconazole, pyrifenox, prochloraz, propiconazole, simeconazole, tebuconazole, tetraconazole, triadimefon, triadimenol, triflumizole, Miconazole;
• Pyrimidinyl carbinoles such as ancymidol, fenarimol, nuarimol;
• 2-amino-pyrimidines such as bupirimate, dimethirimol, ethirimol
• Morpholines such as dodemorph, fenpropidine, fenpropimorph, spiroxamine, tridemorph;
• Anilinopyrimidines such as cyprodinil, mepanipyrim, pyrimethanil;
• Pyrroles such as fenpiclonil, fludioxonil
• Phenylamides such as benalaxyl, furalaxyl, metalaxyl, R-metalaxyl, ofurace, oxadixyl;
• Benzimidazoles such as benomyl, carbendazim, debacarb, fuberidazole, thiabendazole;
• Dicarboximides such as chlozolinate, dichlozoline, iprodione, myclozoline, procymi- done, vinclozoline;
• Carboxamides such as boscalid, carboxin, fenfuram, flutolanil, mepronil, oxycarboxin, penthiopyrad, thifluzamide;
• guanidines such as guazatine, dodine, iminoctadine;
• Strobilurines such as azoxystrobin, dimoxystrobin, enestroburin, fluoxastrobin, kresoxim-methyl, metominostrobin, trifloxystrobin, orysastrobin, picoxystrobin, pyraclostrobin;
• Dithiocarbamates such as ferbam, mancozeb, maneb, metiram, propineb, thiram, zineb, ziram;
• N-halomethylthiotetrahydrophthalimides such as captafol, captan, dichlofluanid, fluoromides, folpet, tolyfluanid;
• Cu-compounds such as Bordeaux mixture, copper hydroxide, copper oxychloride, copper sulfate, cuprous oxide, mancopper, oxine-copper;
• Nitrophenol-derivatives such as dinocap, nitrothal-isopropyl
• Triazolopyrimidine derivatives which are known and may be prepared by methods as described in WO98/46607, such as 5-chloro-7-(4-methyl-piperidin-1-yl)-6-(2,4,6-trifluoro- phenyl)- [1 ,2,4]triazolo[1 ,5-a]pyrimidine (formula T.1);
• Carboxamide derivatives which are known and may be prepared by methods as described in WO04/035589, WO06/37632, WO03/074491 or WO03070705, such as 3- difluoromethyM -methyl-1 H-pyrazole-4-carboxylic acid (9-isopropyp-1 ,2,3,4-tetrahaydro-1 ,4- methano-naphthalen-5-yl)-amide (formula U.1 ), 3-difluoromethyl-1 -methyl-1 H-pyrazole-4- carboxylic acid (2-bicyclopropyl-2-yl-phenyl)-amide (formula U.2) or N-(3 ⁇ 4'-dichloro-5-fluoro- 1 ,1'-biphenyl-2-yl)-3-(difluoromethyl)-1 -methyl-1 H-pyrazole-4-carboxamide;
• Another aspect of invention is related to the use of a compound of formula I, of a composition comprising at least one compound of formula I or of a fungicidal mixture comprising at least one compound of formula I in admixture with other fungicides, as described above, for controlling or preventing infestation of plants, harvested food crops or non-living materials by phytopathogenic microorganisms, preferably fungal organisms.
• a further aspect of invention is related to a method of controlling or preventing an infestation of crop plants or of non-living materials by phytopathogenic or spoilage microorganisms or organisms potentially harmful to man, especially fungal organisms, which comprises the application of a compound of formula I as active ingredient to the plants, to parts of the plants or to the locus thereof, or to any part of the non-living materials.
• Controlling or preventing means reducing the infestation of crop plants or of non-living materials by phytopathogenic or spoilage microorganisms or organisms potentially harmful to man, especially fungal organisms, to such a level that an improvement is demonstrated.
• a preferred method of controlling or preventing an infestation of crop plants by phytopathogenic microorganisms, especially fungal organisms, which comprises the application of a compound of formula I, or an agrochemical composition which contains at least one of said compounds, is foliar application.
• the frequency of application and the rate of application will depend on the risk of infestation by the corresponding pathogen.
• the compounds of formula I can also penetrate the plant through the roots via the soil
• the compounds of formula I may also be applied to seeds (coating) by impregnating the seeds or tubers either with a liquid formulation of the fungicide or coating them with a solid formulation.
• a formulation that is, a composition comprising the compound of formula I] and, if desired, a solid or liquid adjuvant or monomers for encapsulating the compound of formula I, is prepared in a known manner, typically by intimately mixing and/or grinding the compound with extenders, for example solvents, solid carriers and, optionally, surface active compounds (surfactants).
• extenders for example solvents, solid carriers and, optionally, surface active compounds (surfactants).
• the agrochemical formulations will usually contain from 0.1 to 99% by weight, preferably from 0.1 to 95% by weight, of the compound of formula I, 99.9 to 1% by weight, preferably 99.8 to 5% by weight, of a solid or liquid adjuvant, and from 0 to 25% by weight, preferably from 0.1 to 25% by weight, of a surfactant.
• Example 1 This example illustrates the preparation of 4-(4-bromophenyl)-3,6-dichloro-5- (2,4,6-trifluorophenyl)-pyridazine (Compound No.l.1.198)
• the reaction mixture is heated first to 80 0 C for 1 h, then to 90 0 C for 1 h, finally to 100 0 C for 1 h. Subsequently, the mixture is cooled to room temperature and the solvent is removed in vacuo to obtain 3-(4-bromophenyl)-4-(2,4,6-trifluorophenyl)-furan-2,5-dione, which is directly used in the next step without further purification.
• the residue is purified by chromatography on silica gel, using a mixture of heptane / ethyl acetate 9 : 1 as eluent to deliver 4-(4- bromophenyl)-3,6-dichloro-5-(2,4,6-trifluorophenyl)-pyridazine (Compound No.1.1.198) as beige crystals, m.p. 134 - 137 0 C.
• Example 3 This example illustrates the preparation of 4-(4-bromophenyl)-3,6-difluoro-5- (2,4,6-trifluorophenyl)-pyridazine (Compound No. I.I.197)
• a mixture of 4-(4-bromophenyl)-3,6-dichloro-5-(2,4,6-trifluorophenyl)-pyridazine (Compound No. 1.1.198, 2.5 g), potassium fluoride (1.0 g) and 8 ml of dimethyl sulfoxide are mixed and heated to 140 0 C for 24 h. Subsequently the reaction mixture is cooled, diluted with water and extracted with ethyl acetate. The combined organic layer is washed with water and brine, dried over sodium sulfate and evaporated under reduced pressure.
• Tables 1 and 2 below illustrate examples of individual compounds of formula I and formula Il according to the invention.
• R 1 , R 3 and R 4 are as defined in Table 1.
• R 1 , R 3 and R 4 are as defined in Table 1.
• R 1 , R 3 and R 4 are as defined in Table 1.
• R 1 , R 3 and R 4 are as defined in Table 1.
• R 1 , R 3 and R 4 are as defined in Table 1.
• R >1 , r R>3 and R are as defined in Table 1.
• R 1 , R 3 and R 4 are as defined in Table 1.
• R ⁇ >1 , r R>3 and R are as defined in Table 1.
• R , R and R are as defined in Table 1.
• Table 2 shows selected melting point and selected NMR data, all with CDCI 3 as the solvent (unless otherwise stated, no attempt is made to list all characterising data in all cases) for compounds of Table 1.
• Table 2 Melting point and selected NMR data for compounds of Table 1
• Puccinia recondita /wheat / preventive Action against brown rust on wheat
• 1 week old wheat plants cv. Arina are treated with the formulated test compound in a spray chamber.
• wheat plants are inoculated by spraying a spore suspension (1 x 105 uredospores/ml) on the test plants.
• a spore suspension (1 x 105 uredospores/ml) on the test plants.
• the disease incidence is assessed 11 days after inoculation.
• Septoria tritici /wheat / preventive Administered against Septoria leaf spot on wheat 2 weeks old wheat plants cv. Riband are treated with the formulated test compound in a spray chamber.
• wheat plants are inoculated by spraying a spore suspension (10 6 conidia/ml) on the test plants. After an incubation period of 1 day at 22 0 C /
• Gutedel are treated with the formulated test compound in a spray chamber.
• grape plants are inoculated by shaking plants infected with grape powdery mildew above the test plants. After an incubation period of 7 days at 24 0 C / 22 0 C and 70% r. h. under a light regime of 14/1O h (light/dark) the disease incidence is assessed.

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